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Substation Ground Grid Resistance Calculator electrical
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Substation Ground Grid Resistance Calculator

Determine substation ground grid resistance (Rg) and Ground Potential Rise (GPR) using Sverak and Laurent-Nieman equations per IEEE Std 80.

Substation Yard Dimensions

Soil, Rods & Fault Injection

IEEE 80 Grounding Performance

Substation Ground Resistance (Rg)
-- Ω
-- target status
Ground Potential Rise
-- kV
-- V to remote earth
Total Buried Copper
-- m
-- m grid + -- m rods
Substation Yard Surface Area: -- m² (-- sq ft)
Grid Mesh Lines: --
Sverak Depth Correction Factor: --
IEEE 80 recommends substation ground resistance below 1.0 Ω for major transmission/distribution substations to limit GPR and transferred potentials.

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Frequently Asked Questions

What is the Sverak equation in IEEE Std 80?

The Sverak equation is the refined IEEE 80 formula for calculating the electrical resistance to remote earth of a buried substation grounding mesh. It combines buried conductor length, ground rod length, yard surface area, and grid burial depth to provide an accurate resistance estimate for uniform soil conditions.

What is Ground Potential Rise (GPR)?

Ground Potential Rise is the maximum electrical potential that a substation grounding grid attains relative to distant, undisturbed earth when short-circuit fault current flows into the soil. GPR is equal to net grid fault current times grid resistance (GPR = IG × Rg).

Why are ground rods placed along the grid perimeter?

Current density concentrates naturally along the outer edges and sharp corners of a ground grid due to mutual conductor coupling. Placing ground rods primarily along the perimeter dissipates fault current into deeper soil strata, steepening the voltage gradient and lowering touch voltages near the fence.